Study on the corrosion resistance of cordierite-mullite and SiC refractories to Li-ion ternary cathode materials

Microstructures and properties of microporous mullite‐corundum aggregates for lightweight refractories

“…However, the traditional mullite‐corundum refractories are prepared with dense aggregates, which have high thermal conductivities. A large amount of energy is lost through heat dissipation from the refractories 1–6 . Using microporous aggregates instead of traditional dense aggregate to prepare lightweight refractories can effectively reduce its thermal conductivity and heat loss, which is conducive to energy conservation and emission reduction of high‐temperature industrial kilns 7–12 …”

“…A large amount of energy is lost through heat dissipation from the refractories. [1][2][3][4][5][6] Using microporous aggregates instead of traditional dense aggregate to prepare lightweight refractories can effectively reduce its thermal conductivity and heat loss, which is conducive to energy conservation and emission reduction of high-temperature industrial kilns. [7][8][9][10][11][12] Such microporous aggregates can be obtained by crushing and sieving porous mullite-corundum ceramics.…”

Use of Coal Gangue to Prepare Refractory Saggars with Superior Corrosion Resistance and Thermomechanical Properties for the Calcination of Li-Ion Battery Cathode Materials

“…Mullite (3Al 2 O 3 •2SiO 2 ) has been commonly used as the basic refractory component in the manufacturing of refractory saggars, 1−4 used to load Li-, Ni-, Mn-, and Co-bearing precursors for the industrial preparation of Li-ion battery (LIB) cathode materials via solid-state reactions at elevated temperatures. 1,2,5 This is because of the favorable thermal and mechanical properties of these materials. However, mullite is prone to corrosion by Li(Ni x Co y Mn z )O 2 (LNCM) precursors/ materials (especially by the Li 2 O/Li + species originating from them) during calcination, leading to a shortened service time of refractory saggars and contamination of the loaded LNCM materials.…”

“…However, mullite is prone to corrosion by Li(Ni x Co y Mn z )O 2 (LNCM) precursors/ materials (especially by the Li 2 O/Li + species originating from them) during calcination, leading to a shortened service time of refractory saggars and contamination of the loaded LNCM materials. 1,2 Therefore, many approaches have been recently investigated to improve the corrosion resistance of mullitebased materials against LNCM to extend the lifespan of refractory saggars and suppress the contamination of LNCM materials, thus addressing the continuous increase in the global demand for LIB cathode materials. 2,6−8 Based on the corrosion mechanism of refractory materials in contact with LNCM materials, KAlSi 2 O 6 (KAS 4 ), which shows excellent corrosion resistance against LNCM materials, 6 is commonly introduced in mullite-based and andalusite-based refractories.…”

“…Mullite (3Al 2 O 3 ·2SiO 2 ) has been commonly used as the basic refractory component in the manufacturing of refractory saggars, − used to load Li-, Ni-, Mn-, and Co-bearing precursors for the industrial preparation of Li-ion battery (LIB) cathode materials via solid-state reactions at elevated temperatures. ,, This is because of the favorable thermal and mechanical properties of these materials. However, mullite is prone to corrosion by Li­(Ni x Co y Mn z )­O 2 (LNCM) precursors/materials (especially by the Li 2 O/Li + species originating from them) during calcination, leading to a shortened service time of refractory saggars and contamination of the loaded LNCM materials. , Therefore, many approaches have been recently investigated to improve the corrosion resistance of mullite-based materials against LNCM to extend the lifespan of refractory saggars and suppress the contamination of LNCM materials, thus addressing the continuous increase in the global demand for LIB cathode materials. ,− …”